Well, I have a theory... what if valve is just waiting for their new engine to be released and then they will release their 3rd part of each game? I mean - Portal 1, and portal 2 was on Source. Same with L4D series, even for CS:S and CS:GO... and they confirmed that they are making new engine, I suppose its called Source 2.

Well, I have a theory... what if valve is just waiting for their new engine to be released and then they will release their 3rd part of each game? I mean - Portal 1, and portal 2 was on Source. Same with L4D series, even for CS:S and CS:GO... and they confirmed that they are making new engine, I suppose its called Source 2.

This is what I've been under the impression of them doing. After recognizing the success of the Orange box, they are likely going to make a Orange Box 2, with all the thirds. They will release it along side the steam box and new source engine release official release. That's where my money is.

I agree with Frogo on this, they will probably wait for the next engine to release their 3rd games.

Halfe Life (1) has it's own engine, Half Life 2 runs on the Source Engine and Half Life 3 will get it's own engine too. Just saying, I doubt that Valve is going to release their new engine those months. They just released cs:go and Dota 2 is going to be released. These games are still new and when they release their new engine they would be forced to make a new game and it is to early for a new cs.

Yeah, I agree with the source 2 theory as well, but CS:GO still not completed how I see it and L4D2 have some bugs too, and Valve right now add and make some extras, improvements for these games, so maybe they make them 100% complete(atleast one of them), before realize a new game. +Dota 2 (I don't know too much about this game)